These effects are a cause of Rayleigh Scattering. The shorter wavelength blue light is scattered further, as the sunlight passes over a greater distance, and we see the longer wavelength yellow and red light. However, at sunset, light has further to travel through the atmosphere. Reaching Earth's atmosphere, it is scattered in all directions, therefore we see blue sunlight. Blue is scattered more than other colours because it travels as shorter, smaller waves. The diagram below shows that at midday, light has less atmosphere to travel through. This means that there is relatively more yellow and red light left for us to see. She has her purple hair tied into twin buns, a bandage covering her eye. Because blue light is scattered more strongly by the atmosphere, it tends to be scattered several times and deflected away in other directions before it gets to us. Pibby is a light blue humanoid with her arms and legs ending in stubs. Why is the sunset red or orange?Īt sunrise and sunset, the Sun is very low in the sky, which means that the sunlight we see has travelled through a much thicker amount of atmosphere. For example, blue has a short wavelength, while red is created by longer wavelengths. Light that looks white to us, is actually made up of many different colours of differing wavelengths.

Light travels from the Sun and through the atmosphere in invisible waves. As for dusk, it is the opposite of dawn: dawn is the beginning of morning twilight, and. evening twilight is the period after sunset. morning twilight is the period before sunrise, and.

To begin, we need to understand how we see colour. Twilight is the period and the light quality when the sun is only a short way below the horizon.

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